So I spent the money to have my cab removed to have my up-pipes replaced because of a recent whistle noise at certain throttle ranges. Now my stock up-pipes did in fact have a leak....I saw it......but replacing them did not fix the whistle. What do I look at next? Turbos? Exhaust manifolds? Im bummed and running my credit card raw. Other than the noise, the truck runs great.

So I spent the money to have my cab removed to have my up-pipes replaced because of a recent whistle noise at certain throttle ranges. Now my stock up-pipes did in fact have a leak....I saw it......but replacing them did not fix the whistle. What do I look at next? Turbos? Exhaust manifolds? Im bummed and running my credit card raw. Other than the noise, the truck runs great.

Well did they tell you the pipes were leaking or did you tell them to replace them?

If they said they needed to be replaced and there's still a noise they shouldn't of returned the truck to you as at the dealership as this would of failed QT.

Also they could of left a bolt loose or broke a bolt from manifold or up-pipe or even turbos.

Call service manager and ask if they did a QT on your vehicle.

Also give them a chance to resolve the issue and ask them to approve any charges.

If not leaking could just be loose turbo boot.

I had my bed pan replaced and was in shock seeing my truck all taken apart. View my albums. I was lime holy cow hooves.. Lol..

Relax as you are not at least having engine codes..

Also check for black marks around all the silver insulation on the cab that behide the turbos for leaks.

Crap.....and i already did the new 6.4 pipes. So new manifold bolts and gaskets should be the next attempt.

I would make sure before you pull the cab again but broken manifold bolts are fairly common. As GSchretter said check the intercooler boots also and see if you can power brake to see where the whistle is coming from.

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